Emergency lock for revolving doors



Jan, 9, 1940. A. LOCKART EMERGENCY LOOK FOR REVOLVING DOORS Filed May 8, 1939 Patented Jan. 9, 1940 UNITED STATES PATENT OFFICE EMERGENCY LOCK non REVOLVING noons Andrew Lockart, Montreal, Quebec, Canada Application May a, 1939, Serial No. 272,458

1 Claim. (01. 109-8) My invention relates to a means for locking entrance doors to public oroflice building ticularly of that type of door known as a revolving door. a

The device in combination with the door is 1 adapted for use in the event of an emergency, and is operated by remote control from one of any number of locations within the building, to instantly lock the door and sound an alarm.

The device is specially adapted for entrance doors of banks and the like wherein an emergency, in the event of an attempt to hold up or rob a bank, an operator within the building may instantly press a button or switch and securely lock the door, to prevent revolving, which will prevent exit or admission into the building until such time as the lock is released, by the opening of a circuit, which will be closed 20 to set the mechanism into action to lock the door. The alarm bell or any other suitable annunciator will be attached with the exterior of the door casing, and in circuit with the control for throwingthe locking mechanism into action, and will 25 continue to sound the alarm while the door is locked;

In the annexed drawing- Figure 1 is a front elevational view of a revolving door partially in section.

Figure 2 is a top plan view showing the locking 30 mechanism. i

Figure 3 is a detail sectional view of a door and locking pin, and

Figure l is a fragmental detail of the locking ring. e

" A designates the centre postextending vertically up through the centre of the door casing B, and C, designates-the top of the door casing, the parts being in all respects similar to the standard revolving door. Surrounding the centre post A in concentric relation and extending up through the centre of the top of the door C is a sleeve D, to which is secured a metal disc E extending in horizontal relation over a portion of the door top;

45 Secured to the door top C and positioned beneath the disc E is a circular plate F, having formed in the top face a circumferential channel G, and at regular intervals in the path of the channel G are formed a series of pin holes H.

Pivotally'mounted in the head of the centre post A, and extending vertically and securely braced to a beam 1, is a shaft J, upon which is set a governor mechanism, rotated by a worm and gear driven by an electric motor suitably mounted in the upper portion of the casing.

The governor mechanism comprises a flange 2 fixed on the shaft J, and a vertically adjustable sleeve 3, having a radial flange 4 formed integral therewith. Connected with the flange 2 and sleeve 3 are spring bars 5, on which are 5 fixed metal balance balls 6.

Secured to the upper portion of the shaft J, is a worm gear I adapted to mesh with a driving gear 8, fixed on the end of a shaft '9 of an electrical motor l0, mounted in .the upper portion of the door casing B.

Connected up with the motor I0 is a circuit connection II and switch-control l2, the switch being located" atsome suitable position within the building at some distance from the motor, whereby an operator may close the circuit to throw the motor into action to operatethe parts to lock the door.

In circuit with the circuit II and controlled by the switch I2, is an alarm bell l3, fixed at some convenient position on the exterior of the door casing, which will sound an alarm when the door is locked.

Pivotally mounted in a bracket'K, secured to the top face of the flange E is a lever bar L extending in radial relation across the flange, and M, designates a tripping lever, pivotally connected with the inner end of the lever bar .L, and having formed therewith a bifurcated head, adapted to engage in operating contact with the radial flange l of the adjustable sleeve 3 mounted on the shaft J.

On the outer end of the lever bar L is attached a depending pin N, with the end projecting through an opening in the disc E, and engaging in the circumferential channel G in plate F, immediately beneath. I

Any number of lever bars may be used, but for all practical purposes I have found four sufflcient, and located at regular intervals, and 40 adapted to actuate in unison.

To look the door the switch I2 is set to close the circuit with the source of electrical energy, which will immediately throw the motor l0 into motion, and rotate the pinion 8, on the end of the shaft 9, and in mesh with the worm gear 1, fixed to the shaft J, rotate the shaft and the parts attached thereto.

By the rotation of the shaft J, the balls 6 secured on the spring bars 5, will extend by cen- 60 trifugal action and contract the springs and raise the sleeve 3 up on the spindle J, and being in actuating contact with the trip lever M, will raise the end of the lever bar L at the inner end, and force the outer end downwardly, and the pin N fixed on the end thereof downwardly through the opening 0, to register with and enter into any one of the bores H, and thereby prevent further rotation of sleeve .and the disc attached thereto, and the sectional door P, which is also aiiiiied to the sleeve D and which revolves therew In the drawing I have shown a ball race R formed in the underside of the disc E and a corresponding ball race S, in the top face of the plate F, in which is set antifriction balls T, to reduce any contact friction between the disc and the plate.

Slight modification may be made in the arrangements of the parts without deviating from the nature of my invention.

What I claim as new and desire to claim as Letters Patent is:

An emergency lock for revolving doors, in combination a post extending vertically through the centre of the door casing; a locking plate secured to the top face of said casing, a sleeve surrounding the said centre post, a metal disc secured to said sleeve and projecting over the said locking plate,

lever bars pivotally mounted on said disc and adapted to be tilted to project a. locking pin fitted on the outer ends thereof into a pin hole formed in the said locking plate, a shaft pivotally supported and extending vertically from the top of said centre post, operating means adjustably mounted in said shaft under motor control therewith for actuating'the said lever bar to project the said locking pin into one of the bores in said locking plate.

ANDREW LOCKART. 

